Question

(8а-5)(9а+10)-(12а-7)(11+6а)+55а​

Answer 1

$= 72 {a}^{2} + 80a - 45a - 50 - 132a - 72 {a}^{2} + 77 + 42a + 55a = 72 {a}^{2} - 72{a}^{2} + 132a - 132a + 77 - 50 = 77 - 50 = 27$

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